Changes since "V 2.7.1 FULL PACKAGE"

* Fixed: Prefix and Price update when adding new product.
* Fixed: Paths problem (on some systems).
* Fixed: SQL Query about adding price/prefix in the templates.
* Fixed: Default values when adding new option values thanks to pbor1234
* Added: french language thanks to zardhoz

note: I am not the original creator of the contribution

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